I responded but don't think it was sent. I think Yutaka in Somerville would be great for a group. Its a hibachi restaurant.
www.yutakanj.com

If you want casual dining, like jeans and t-shirt dress code, try Joe's Pizza down on Rt. 206S in Hillsborough. It's in the Mountainview Plaza. You can opt to sit on the service side of the restaurant which is nicer. The dinner entrees are really good. http://www.joesfamilypizzeria.com/contactus.html